Beam

Beam is very eccentric, naive and innocent. With the exception of Denji, Beam is often very violent and antisocial, and doesn't interact with others. He often goes along with Denji's plans no matter how crazy they are due to having a lot of respect for the Chainsaw Devil. His devotion to Chainsaw Man is such that he always tries to protect Denji personally and will offer his blood to revive him, even if ends up severely hurting or killing him. He is shown to greatly enjoy fighting, eagerly diving into packs of zombies and eating them, though he was greatly afraid of having to fight against Reze to the point of fleeing, but showed no hesitation in trying to fight back against her when cornered.

Beam possesses the body of a muscular young man. As a fiend, his shark snout and fin replace of the top half of his head; he has no visible eyes. He has short, spiky black hair and very sharp teeth. He exclusively wears swimming trunks. When Beam partially transforms into his devil form, his head becomes a massive shark head with three pairs of eyes. In his full transformation, his entire body resembles a shark but with multiple sets of long fins that he uses as legs. Beam's Shark form.png|Devil Form (Manga) Denji riding Beam's Shark Form.png|Devil Form (Anime)

As a Fiend, Beam can't make contracts with Devils and his powers are considerably weaker than those of his devil form. However, he still has all the other standard devil abilities.